Stadium: Court 5 Round: 62 Ground: Clay
| ITF Netherlands F3 | 2018/07/07 09:30 | Guenther, Valentin v Khlif, Noe | 4-6,6-2,6-4 |
| ITF Netherlands F3 | 2018/07/07 08:00 | Guenther, Valentin v Roland Stuurman | 3-6,6-2,6-2 |
| ITF Netherlands F2 | 2018/07/03 10:05 | Guenther, Valentin v Niklas-Salminen, Patrick | 4-6,3-6 |
| ITF Netherlands F2 Qual | 2018/07/02 11:45 | Guenther, Valentin v Erdbories, Tillmann | 6-7,6-1,2-6 |
| ITF Netherlands F2 Qual | 2018/07/01 08:00 | Guenther, Valentin v Sollie, Thorsten | 7-6,6-7,6-4 |
| ITF Netherlands F1 Qual | 2018/06/24 09:00 | Guenther, Valentin v de Goeijen, Bobby | 2-6,3-6 |
| ITF Germany F4 | 2018/06/21 08:30 | Boehler, Dominik v Guenther, Valentin | 6-4,6-4 |
| ITF Germany F4 | 2018/06/19 14:35 | Guenther, Valentin v Hoeveler, Leon | 6-3,6-2 |
| ITF Netherlands F3 | 2018/07/07 09:30 | Louis Van Herck v Moroni, Filippo | 1-6,0-6 |
| ITF Netherlands F3 | 2018/07/07 08:00 | Reynolds, Rob v Moroni, Filippo | 5-7,0-6 |
| Italie F10, Qualifications Simples | 2018/05/16 15:30 | Jannik Sinner v Moroni, Filippo | 7-6,6-3 |
| Italie F10, Qualifications Simples | 2018/05/15 13:00 | Moroni, Filippo v Mitjana, Leny | 6-4,6-1 |